A lawsuit filed against Ellen DeGeneres over a boob joke she made on her hit US chat show has been thrown out by a judge.

Ellen had made a quip about Georgia real estate agent Titi Pierce's name by pronouncing it "Titty" during a skit on The Ellen DeGeneres Show last year.

Pierce tried to sue producers, arguing that her name is pronounced 'Tee Tee', and Ellen's joke had led to her being harassed with unwanted nuisance phone calls.

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But the judge sided with Ellen, and said (according to court papers obtained by TMZ): "The letter 'i' in the English language can be pronounced in several ways. While Titi chooses to pronounce her name with 'e', there is nothing demonstrably false in pronouncing it with 'i' as DeGeneres did."

The 59-year-old star was introducing a segment called 'What's Wrong With These Ads... and These Signs?' when she showed Pierce's real estate sign, sent in by a fan, and shortly after airing another sign which read 'Nipple Convalescent Home'.

"Titty Pierce, sounds like she might have spent some time in that nipple home, I don't know," Ellen had deadpanned.

Pierce made monetary demands in compensation and requested the removal of Ellen's show from the air. She also maintains that no-one has ever called her 'Titty' in her "35 years of life".

The case was thrown out by the judge, and Ellen's show is contracted to run for another three years until 2020.